An Oklahoma father accused of killing his 22-year-old daughter told 911 operators she shot herself in the face and then acted suspiciously when first responders arrived to investigate.

Ronald McMullen, 43, phoned authorities just before 6 a.m. on June 29, telling them his daughter had committed suicide. When they arrived at his home in Norman, they found Kailee Jo McMullen dead from a single gunshot wound to the face, News 9 reported.

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Ronald Lee McMullen, 43, called 911 on June 29 and said that his daughter was shot in the face. (Cleveland County Detention Center)

"Sir, do not hang up. Did she do this to herself?" the 911 dispatcher can be heard asking in recently released audio.

"Yes," he responds. "She's gone, I'm telling you she's gone."

Despite claims that the 22-year-old EMT's fatal wound was self-inflicted, officers detained McMullen on July 5.

A search warrant filed in Cleveland County alleges the father's strange behavior at the scene immediately made investigators suspicious.

"The evidence that was collected from the scene and as we've worked through the initial investigation, that's when the death became suspicious," Noman Police Department's Sarah Jensen told News 9. "We didn't feel like the things that we were able to gain from the scene connected to the story he told."

When first responders arrived, McMullen was drenched in blood and told officers he did not know where the firearm was, KFOR reported. It was clear to investigators the gun used had been moved prior to their arrival.

Kaille Jo McMullen, 22, was found shot to death at her Norman home. (facebook)

While officers were attempting to photograph the scene, McMullen allegedly "kept trying to wipe off the blood all over him with a towel," according to the affidavit. They also discovered towels in the kitchen that had been used in an attempt to clean blood up from the scene.

Police allegedly had to physically restrain McMullen "several times" to prevent him from cleaning his hands, according to the affidavit, cited by News 9.

"After pictures were taken, Ronald McMullen lay down in the dirt, began covering himself in dirt while rubbing the shoes he was wearing (also covered in blood) on the concrete entryway," the document states.

He was booked in the Cleveland County Detention Center on a complaint of first-degree murder. Authorities have not released a possible motive in the shooting.